gengembre hubebt



(No Model.) L v H. G. HUBERT.

' l MOLD FOR GASTING SAW TB'ETH. No. 382,088. Patented Maw 1,1888.

lulull'f f uluznlu Illl u u NITED STATES PATENT Grises.

H. GENGEMBRE HUBERT, OF NEW YORK, N. Y.

Moto Fos CASTING sAw-TEET|-|.

SPECIFICATION forming part of Letters Patent No. 382,088, dated May 1,1888.

Application tiled February 29. 1888. Serial No. 265,687. (No model.)

To all whom it may concern.-

Be itknown that I, H. GENGEMBRE HUBERT, of the city and county of NewYork, in the State of New York, have invented a new and usefulImprovement in Molds for Casting the Teeth of Diamond Saws, ot" whichthe following is a specication.

In modern stone sawing machines,in which the saw-blade is armed withdiamonds or'other hard stones,the diamonds are secured in teeth whichseverally consist of small blocks or pieces of metal-as steel-detachablysecured in the saw-blade. These small pieces or blocks of steel whichcontain the diamonds are termed the teeth of the saw. Formerly to insertthe diamonds in these teeth a small cavity or recess was drilled in thetooth of suicient sizel to receive the diamond, and after dropping lthediamond into such recess or cavity the metal of the tooth was calkeddowuover the edges of the stone, so as to hold it in place. Morerecently the diamonds or stones have been placed in asuitably-constructed mold and molten metal, usuallysteel, has been castinto the mold, so as to secure the diamond in place in the tooth by theoperation of casting the tooth. Vhen this latter course is followed,itis necessary to hold the diamonds in place in the mold-cavity, so thatthe molten metal,when poured in,will not displace them, and this hasbeen done by means of pins or screws which vhave taper or conicalpoints, and which are employed one for each diamond in a tooth to pressthat diamond against the opposite side of the mold-cavity, and thus holdit in place.

l When the diamond is t-hus held in place, the

tooth,after casting, will havein one side a couical hole formed by thepin or screw and in the other side will have a larger cavity or openingformed by the chilling of the metal which iiows around the diamond andagainst the wall of the mold in contact with which the diamond rests,and these holes are subsequentlyr filled up by brazing,in order to givethe tooth a solid and perfect appearance, and also that the diamond willbe,more securely held.

The object of luy/"invention is to provide a mold in which the diamondis held by pins entirely out of contact with the walls of the mold andin the mold-cavity at a distance from both sides thereof, so that lwhenthe metal is cast it will dow completely around and fully envelop thediamond, and the pins which support the `diamond will be embedded in themetal of the tooth, and after the tooth is removed from the mold may becutoff flush with the metal thereof.

The invention will be hereinafter described, and particularly pointedout in the claims.

In the accompanying drawings, Figure l is a longitudinal section of amold embodying my invention, and which is constructed with threetooth-cavities, so that three teethmay be cast therein at one operation.Fig. 2 is a transverse section of the mold upon. theplane indicated bythe dotted line :c av, Fig. l, Fig. 2* is a partly sectional side view,upon a larger scale, of one of the screws and pins employed in my mold.Fig. 3 is ahorizontal section upon theplane indicated by the dotted liney y, Fig. 1. Fig. 4 is a plan view or horizontal section upon the planeindicated by the-dotted line o o, Fig. 1f Fig. 5 isa transverse sectionof a mold which has been heretofore in use fior casting teeth. Fig. 6 isa side view of a. tooth which may be cast in the mold shown in Fig. 5.Fig. 7 is asection through that tooth upon about the plane indicated bythe dottedeline z z, Fig. 6. Fig. 8 is a side vview of a tooth which hasbeen cast in my mold; and Fig. 9 is a sectional view of that tooth uponthe plane indicated by the dotted lines s s, Fig. 8.

Similar letters of reference designate corre-V 6 and 7, and these viewsare simply made to illustrate one form of mold heretoforeused and thetooth cast in thatlmold, in order that the salient points of myinvention may be moreV alternate diamonds are near one face or side ofIco the tooth, while the intermediate diamonds are near the other faceor side thereof. By

means of a setscrew, p', which has. a conicalv point, as shown in Fig.5, each diamondp is held vin place close against the opposite wall ofthe cavity O, and these screws p' are inserted alternately from oppositesides of the mold. Vhen the tooth is cast and removed from the mold, itwill have on one side ofeach diamond a conical cavity, p2, which wasformed by the point of the screw, and on the other side of each diamondwill be a larger cavity, p3, as is best shown in Fig. 7. This largercavity,p3,is formed by the chilling of the metal against the wall of themold in contact with which the diamond is held, as by such chilling themolten metal is prevented from owing around the diamond on that side ofthe tooth as far as it otherwise would. After these teeth are cast theyare brazed, so that the holes or cavities ends formed with slightlyconcave or conicalpipa become filled with brass and give smooth oppositesides to the Vtooth and hold the diamonds p more securely vin place. f

Beferring,now,to Figs. 8 and 9,which show a tooth cast in my mold, P'designates the tooth, andp designates the diamonds,which are embeddedtherein. n n designate pins whereby the diamond is held in place in themoldcavity, as I shall hereinafter describe, and which in the operationof casting become embedded in the metal of the tooth P' and aresubsequently cut oft flush with the outer surfaces ofthe tooth. Thesepins, which may con# sist simply of small wire nails, are so small thatthe body of metal in them is not sutcient to chill the metal of thetooth when cast, and consequently the metal Hows freely around the pins,as shown in Fig. 9, and byits shrinkage holds fast upon the pinsembedded within it, so that when these pins are out ott the joint whichthey form with the metal of the tooth can scarcely be detected. I preferthat the pins n n', 'at least those pins which bear against oppositesides of the diamond, shall have their cavities n2, as shown in Fig.2*,so that such cavities will receive the points or projections of thediamond and will hold the latter more securely in place and prevent itsslipping out from between the pins whelnthey are tightened up againstit. These concave recesses or conicalcavities'n2 may be formed bysetting the 'pin or nail in a hole in a block of metal and then strikingupon theirends a sharp blow with a center-punch. The surfaces of thoseportions of the pins which are to be embedded in the metal of the toothP' may be ronghened, as by grooving them or striking up spurs from them,as shown at n3 in Fig. 2*.

-I will now describe by reference to Figs. 1, 2, 2*, 3, and 4 the moldwhich forms the subject of my invention.

The lower portion of the moldis composed of sections A A', and in thisexample of the invention they have between them a third section, 2,these'threesections being clamped together when the mold is closed forcasting by means of bolts a. rAbove the lower part of the mold is anintermediate part composed ins n n' as before described.

ofthe sections B B', which are held together as I shall soon describe,and above the sections B yB' is the upper part,which is composed ofsections C C', held together by bolts c, and in which are thepouring-cavities c. The three parts of the mold-namely the lower part,the

the pouringholes c communicate and which are formed principally betweenthe sections B B' ot' the mold, but which extend downward into the lowerportion between the sections A A', as is best shown in Figs.4 l and 2. Ihave shown the lower part of the mold cavity,which is formed between thesections A A', as hav-g ing upon opposite sides lateral enlargements orrecesses d, and consequently the teeth when cast in the cavities D haveupon opposite sides protuberances or lumps p4, as is represented inFigs. 8 and'9. The diamonds@ are heldin proper position in themold-cavities by the As here represented, pins n are inserted downwardinto the portion of the mold which forms the bottom of the cavities D-inthis instance into the section Al--and upon these pins the diamondrests, while it is held against lateral displacement by the pins nu',which bear against opposite sides of it. The several pins n n are all ofthem removably tted in the mold-sections, so that after the teeth arecast and when removing them from the mold the pins embedded inthe teethby the operation of caste ing are readily withdrawn with the teeth fromthe mold-cavities. my invention thel pins n' are set up and held inplace to properly hold 'the diamond, each by means ot' a thumb screw orset screw, n, which is tapped into a socket or cavity in the moldsections, and, as best shown in Fig. 2*, each screw n4 has a centralcavity, ai", which receives the pin n', and the pointed end n of saidpin bears against the bottom of said cavity n. Consequently the screw n4may be turned to press the pin n against the diamond withont impartingany turning movement to the pin and thereby incurring the liability ofthe diamond being displaced. I have here repre- IOO In the presentexample of IIO sented three'diamonds as held in place ineach mold-cavityD, and it will be understood that a greater or less number than threemay be cast into each tooth. As best shown in Fig. 8, the severaldiamonds p in each tooth are not in a straight line, but are staggeredin position, alternate stones being nearer one side ot' vI 25 the cavityD and the intermediate stone or stones being nearer the opposite side ofthe cavity D. The upper sections, C C', and the intermediate sections, BB', of the moldmay readily be removed from the lower sections, A A', andare so removed during the operation of setting the diamondsp in place inthe mol'dcavities and adjusting the screws n* Aso as to properly securethe diamonds.

@sepas As best shown in Fig. 4, the sections B B'of the mold have upontheir adjacent faces vertical ribs b, and the section B has at its endslugs or ears b', in which are inserted screws b2 b3. The section B' isplaced between the lugs or ears b', with its ribbed face against theribbed face of the section B, as is shown in Fig. 4, and by the screws bb3 the section Bis held immovable relatively to the section B. The ribsb on one section, B, enter between the ribs l) on the opposite section,B, and the corresponding ends-for instance, the righthand endsof all themold-cavities D are formed by ribes b on one section, B', while theother corresponding ends-for example, the left-hand ends-of all themoldcavities D are formed by thek ribs b upon the other section,

, B. To remove the teeth after casting from the moldcavities D, thescrew-b5, for example, is loosened, so that the section B may be slippedtoward the right relatively to the section B, thus removingthe end wallsof each mold-cavity D from each other and permitting the easy removal ofthe teeth from the moldcavities. After the removal of the teeth thelumps p4 and all portions of the metal outside the cutting-faces of thestones may be ground off bygrindstones or other means to expose the saidfaces; but for operating on some gritty kinds of stone this preparatorygrinding is not necessary, as the grinding off of the superfluous metalmay be rapidly effected during a few strokes of the saw bythe action Vofthe stone on which the saw is putin operation.

Then the parts of the mold are` assembled again for casting more teeth,it is necessary that the mold cavities D be adjusted to the exact lengthrequired, and this is done at one operation by means of theset-screws?)2 b, because the corresponding ends of all the moldcavitiesare formed by the ribs b, as before described. 'Ihe screw b, forexample, may serve as the adjustingscrew, and when it is adj usted tothe proper point, so that the moldfcavities D will be of the exactlength required, it is not again disturbed, and only the screw b3, whichmay be termed the clamping-screw, is slackened in order to enlarge themold-cavities D in their length and facilitate the removal of the teeththerefrom. To again assemble the parts of the mold, all that isnecessary is to place the section B against the adjusting-screw` b andthen to set up the clamping-screw b3 until the section B is held tightlyin place relatively to the section B. After the adj usting-screw hasbeen previously set to the proper point the moldcavi ties D will be ofthe exact length required when the screw ba is set up, without thenecessitytof the operator paying any particular attention to thisadjustment. .It will therefore be seen that it is of great advantage tohave the ends of the mold-cavities D formed by the ribs b, the ribsbforming the right-hand ends of all the cavities being upon one section,B', and the ribs b forming the left-hand ends of all the cavities beingupon the other section, B, as before described, because of the facilitywhich is thus afforded for adjusting all the mold-cavities D to theexact length required.

When the ends of the mold-cavities are formed by separate pieces orblocks placed between the two side sections, B B', and each separatelyadjustable, the adjustment of these pieces or blocks each time the partsof the mold are assembled together, in order to give the exact lengthrequired to each of the moldcavities, becomes a matter of considerablelabor and great nicety, and such careful and separate adjustment is alldone away with by my invention. As shown in Fig. 4, the faces of theribs b which form theends of the moldcavities D are V-shaped,so that theteeth cast in such cavities will have their opposite ends V- shaped, andthus be adapted to be fitted in the gaps or recesses in the edge of asaw-blade.

In order to vent the mold-cavities, I form in the meeting or bearingfaces of one or more of the separable sections of which the mold iscomposed line or small grooves which lead from the moldcavities andserve for venting it. I have here represented the upper faces of thesections B B as havinga considerable number of small grooves, e, cut inthem and leading outward from the moldcavity D. The moldA cavity D isproperly vented through these small grooves e, and when the metal risesAt0 the grooves itis chilled before it can fill them and will flowoutward into the grooves but asmall fraction of an inch. The small spursor projections which are formed on the teeth. by the metal running overslightly into these vent holes or grooves e may without difficulty beAbroken or cut away from the teeth, and] do not at all interfere withthe ready removal of the teeth from the mold-cavities.

For more thoroughly venting the mold-cav ities I may cnt horizontalgrooves e', which are also small, in the outer face of certain of theribs b, as best shown in Figs. l and 2, and through these grooves themoldcavity vents into the space e2 between adjacent ribs b, and thencethrough an opening, e5, formed in the upper moldsections, C C', vents tothe atmosphere.

I do not claim, broadly, as of my invention a mold provided with pins orscrews for holding the diamonds in place within the moldn cavity; butlimit my invention to pins which are removably fitted in the mold inpositions opposite each other and which project into the mold-cavityfrom opposite sides thereof, whereby a stone supportedV between the endsof such pins will, when the tooth is cast, be

completely surrounded by metal in which the pins will be embedded.

What I claim as my invention, and desire to secure by Letters Patent,is- 4 l. The combination, in a mold for casting saw-teeth with diamondsor other hard stones, of the mold-sections constructed to form a cavity,and pins removably fitted opposite each other in said sections andprojecting into IOO IIO

said cavity from Opposite sides thereof, whereby a stone supportedbetween the ends of said pins will, when the tooth is cast, becompletely surrounded by metal 'in which the pins are embedded,substantially as herein described.

2. Thecombination,with mold-sectionsforrning a cavity between them, ofpins n n, removably fitted in said sections and projecting into thecavity opposite each other, the said pins having enpshaped or concavedinner ends for more securely retaining a stone bletween them,substantially as herein described.

3. The combination, with the two side Sec- 4 tions of a mold having inthe cavity formed between them the lateral enlargements d, of pinsremovably fitted in said sections opposite each other and projecting'into the cavity on opposite sides thereof and from said lateralenlargements, substantially as herein described.

4. The combination, with the lower moldsections,A A A2, constructed toform portions of mold-cavities, and pins un', fitted thereto for holdingstones therein, of the upper mold-sections, B B', supported on saidlower mold-sections and provided on their faces with ribs b, the saidsections B B being placed face to face, with theribs D of each betweenthe ribs b of the other, and containing portions of moldcavities whichcorrespond with those in the sections A A A2, and which have all their`right-hand ends formed by the ribs of one section and all theirleft-hand ends formed by. the ribs of the other section, substantiallyas herein described. v

5. The combination of the mold-sections B B,.the latter having lugs orears between which the former is placed, and the two sections having theribs b, and the adjusting and clamping screws b2 b3, inserted in thesection B and lbearing on the ends of the section B, substantially as`herein described.

H. GEN GEMBRE HUBERT.

Witnesses:

C. HALL, FREDK. HAYNEs.r

